Since you know the taxable amount, enter that $1,900 in box 2a. The gross distribution of $10,000 should be reported in box 1 of your 1099-R form.
Per the IRS here, you only have to report the income for the amount of proceeds that exceed your cost in premiums (less any refunded amounts).
Follow the steps in this link to get to the 1099-R input section. Then select edit to the right of the applicable 1099-R form and proceed through the screens to update the amounts for box 2a.
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